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In this paper, prototypes of SC-cut resonators with 5 MHz resonant frequency are presented. The resulting short-term stability of some resonators has been measured lower than 8·10−-14 in terms of Allan standard deviation. The results are compared according to the overtone behavior on different vibrating modes to find a correlation with the intrinsic noise of the resonators. The comparison of these...
In this paper, the description of the resonator realization and the topology of the resonator prototype is exposed. Phase noise measurements of a hundred of resonators are given. The noise results are discussed according to the position of the resonators inside the crystal block and physical analysis of the crystal (dislocation). The results are also compared according to their Q-factors measured...
In this paper, we describe an original digitally controlled double thermostat system for the quartz crystal oscillator that allows setting the turnover point of crystal oscillator automatically and its characterization. The oscillator optimization was implemented with ADS software. This simulation included the resonator noise and amplifier noise, which was measured previously for different transistors.
This paper deals with the main results about LGT crystals and, as far as possible, indicates the comparative aspects with the quartz crystal. We present also the manufacturing process and their differences with a quartz resonator. The passive noise analyses and the drive level effect are presented in the paper as well as the g-sensitivity and the magnetic sensitivity of LGT oscillators. Example of...
This paper investigates some properties of vibrating beam resonators in length extensional mode and mainly the energy loss by coupling between the beam and the frame of the device. The resonators were designed and built using an alternative material of quartz, the langasite (LGS), which has some interesting piezoelectric and thermal properties. The process of microfabrication is based on the anisotropic...
In this paper, we describe the hardware and software designing process and characterization for an original digitally controlled double thermostat system for the quartz crystal oscillator. This allows setting the turnover point of crystal oscillators automatically. Developed for metrological purposes of active phase noise measurements, this type of thermostat with a crystal oscillator is an ultra-stable...
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